0700461908708 datasheet(20/25 Pages) PYCOM

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18.0 Design Considerations

18.1

Antenna Impedance

Our OEM modules are intended to be used with a 50–ohm

antenna. They are also required to be connected to the

antenna by a 50–ohm grounded co–planar waveguide (as

shown in the reference design below with the yellow lines)

or a microstrip.

18.2

Deep sleep power

When selecting a voltage regulator for your application

ensure that it has a low power mode, and that this is

enabled when the device enters deep sleep. We also

recommend cutting off power to all non–essential

components such as LEDs, logic gates, sensors etc.

when the device is in deep sleep. This can be done

using the circuit shown right:

This circuit uses the 1.8V output of the module to cut off

supply to non–essential circuitry. The 1.8V output is only

active when the module is running, when it goes to deep

sleep it drops to 0V. The non–essential circuitry is then

powered from the “ACTIVE_POWER” bus.

Figure 7 – 50–ohm impedance antenna connections

Figure 8 – Power switch for deep sleep mode

0700461908708 Datasheet(PDF) 20 Page - Pycom